There is a growing tendency among employers to hire casual staff.
雇主雇用临时职员有增加的趋势。
To the casual observer, the system appears confusing.
乍看起来，这个系统好像条理不清。
It's obvious even to the casual observer.
即便再马虎的人也能一眼看明白是怎么回事。
He tried to sound casual, but I knew he was worried.
他讲话时试图显得不在乎，但我知道他心里着急。
Add a scarf for a casual effect.
再围上一条围巾以显得随便些。